Php Code: Matrix Operations Class

If you are a student or a researcher, you may need to offer some asthmatics in your website. This script has a class for doing some matrix operations such as Multiplying, Adding, Subtracting and Dividing.
You can learn how to combine HTML + PHP + Mathematics with this code; Enjoy!
<!-- This Script is from www.phpfreecpde.com, Coded by: Kerixa Inc-->
<?php
$r='';
$M1='';
$M2='';
if (isset($_POST['Submit'])){
	$M1=$_POST['m1'];
	$M2=$_POST['m2'];
	$m1=explode("\n",$M1);
	$m2=explode("\n",$M2);
	for ($i=0; $i<count($m1);$i++)
		$a[$i]=explode(',',$m1[$i]);
	for ($i=0; $i<count($m2);$i++)
		$b[$i]=explode(',',$m2[$i]);
	$op=$_POST['operation'];
	$mat=new matrix;
	switch ($op){
		case 'Divide':
			$b=$_POST['m2'];
			$rr=$mat->divide($a,$b);
			break;
		case 'Multiply':
			$rr=$mat->multiply($a,$b);
			break;
		case 'Add':
			$rr=$mat->add($a,$b);
			break;
		case 'Subtract':
			$rr=$mat->subtract($a,$b);
			break;
	}

	for ($i=0;$i<count($rr);$i++){
		for($j=0;$j<count($rr[$i]);$j++)
			$r.=$rr[$i][$j].',';
		$r=substr($r,0,strlen($r)-1)."\n";
	}	
}	
class matrix{
	public function multiply($m1,$m2){
		$r=count($m1);
		$c=count($m2[0]);
		$p=count($m2);
		if(count($m1[0])!=$p)die('Incompatible Matrixes');
		for ($i=0;$i< $r;$i++){
			for($j=0;$j<$c;$j++){
				$m3[$i][$j]=0;
				for($k=0;$k<$p;$k++){
					$m3[$i][$j]+=$m1[$i][$k]*$m2[$k][$j];
				}
			}
		}
		return($m3);
	}
	
	public function add($m1,$m2){
		if (count($m1)!=count($m2) || count($m1[0])!=count($m2[0])) die('Incompatible Matrixes');
		for ($i=0;$i<count($m1);$i++){
			for($j=0;$j<count($m1[0]);$j++){
				$m3[$i][$j]=$m1[$i][$j]+$m2[$i][$j];
			}
		}
	return($m3);
	}
	
	public function subtract($m1,$m2){
		if (count($m1)!=count($m2) || count($m1[0])!=count($m2[0])) die('Incompatible Matrixes');
		for ($i=0;$i<count($m1);$i++){
			for($j=0;$j<count($m1[0]);$j++){
				$m3[$i][$j]=$m1[$i][$j]-$m2[$i][$j];
			}
		}
	return($m3);
	}

	public function divide($m1,$m2){	//$m2 must be num
		if (is_array($m2)) die ('Pleae enter e number for deviding not an array');
		for ($i=0;$i<count($m1);$i++){
			for($j=0;$j<count($m1[0]);$j++){
				$m3[$i][$j]=$m1[$i][$j]/$m2;
			}
		}
	return($m3);
	}

}
?>
<form method="post">
	<div style="text-align: center">
<table style="border: 1px solid #000000;width: 543px" align="center">
	<tr>
		<td style=" padding: 5px; font-family: 'Times New Roman', Times, serif;font-size: 17pt;text-align: center; width: 269px; color: #2214B9;border-style: solid;border-width: 1px; background-color: #FFFFD7;">
		<strong>Matrix 1</strong></td>
		<td style="padding: 5px;font-family: 'Times New Roman', Times, serif;font-size: 17pt;text-align: center; color: #2214B9;border-style: solid;border-width: 1px; width: 270px; background-color: #FFFFD7;">
			<strong>&nbsp;&nbsp; 
			Matrix 2</strong></td>
	</tr>
	<tr>
		<td style=" padding: 5px; font-family: 'Times New Roman', Times, serif;font-size: 17pt;text-align: center; width: 269px; color: #2214B9;border-style: solid;border-width: 1px; background-color: #D8FFD7;">
				<textarea name="m1" style="height: 174px; width: 237px; font-size: 14pt; font-family: 'times New Roman', Times, serif;"><?php echo $M1?></textarea></td>
		<td style="padding: 5px;font-family: 'Times New Roman', Times, serif;font-size: 17pt;text-align: center; color: #2214B9;border-style: solid;border-width: 1px; width: 270px; background-color: #D8FFD7;">
				<textarea cols="20" name="m2" rows="1" style="height: 174px; width: 237px; font-size: 14pt; font-family: 'times New Roman', Times, serif;"><?php echo $M2?></textarea></td>
	</tr>
	<tr>
		<td style=" padding: 5px; font-family: 'Times New Roman', Times, serif;font-size: 20pt; text-align: center; color: #2214B9;border-style: solid;border-width: 1px; background-color: #D7E5FF;" colspan="2">
		<select name="operation" style="width: 140px; font-size: 14pt; font-family: 'times New Roman', Times, serif">
		<option selected="">Multiply</option>
		<option>Divide</option>
		<option>Add</option>
		<option>Subtract</option>
		</select><br><br style="font-size: 10pt">
			<input name="Submit" style="width: 95px; height: 48px; margin-top: 0px; font-size: 20pt; font-family: 'times New Roman', Times, serif;" type="submit" value="Do"></td>
	</tr>
</table>
		<br>
<?php if (isset($_POST['Submit'])) {?>
		<span style="font-family: 'Times New Roman', Times, serif; font-size: 20pt; color: #1A7D16">
		Result of <?php echo $op?>ing: </span><br>
		<textarea cols="20" name="TextArea3" rows="1" style="height: 174px; width: 237px; font-size: 14pt; font-family: 'times New Roman', Times, serif; background-color: #FFD7F6;"><?php print_r( $r)?></textarea></div>
<?php }?></form>
<div style="text-align: center">
	<font face="Tahoma"><a target="_blank" href="http://www.phpfreecode.com/">
	<span style="font-size: 8pt; text-decoration: none">PHP Free Code</span></a></font></div>
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